We should never add water into the acid because:

The reaction is exothermic.

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The reaction does not take place.

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The reaction is slow.

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The reaction is endothermic.

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Solution

The correct option is A
The reaction is exothermic.

The reaction of an acid with water is exothermic in nature as a lot of heat is liberated during the reaction. The heat produced changes a fraction of water into steam which tends to escape. This results in splashing of acid which can turn out to be dangerous.

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Similar questions

Read the following statements

(i) When a red litmus paper is dipped into reaction mixture of a saponification reaction, it turns blue and the reaction is exothermic.

(ii) When a blue litmus paper is dipped into reaction mixture of a saponification reaction, its colour does not change and the reaction is exothermic

(iii) When a red litmus paper is dipped into reaction mixture of a saponification reaction, its colour does not change and the reaction is endothermic.

(iv) When a blue litmus paper is dipped into reaction mixture of a saponification reaction, its colour does not change and the reaction is endothermic.

Which of the above statements are correct

The process of respiration is :

(a) an oxidation reaction which is endothermic

(b) a reduction reaction which is exothermic

(d) an oxidation reaction which is exothermic

Q. STATEMENT-1: Phenols cannot be converted to esters by direct reaction with carboxylic acids whereas alcohols can.

STATEMENT-2: This is because esterification reaction is exothermic for alcohols but slightly endothermic for phenols.

Q. Formation of

N_{2} H_{4}

is an exothermic reaction but the combination is an endothermic reaction.

Q. (a) What do you understand by exothermic and endothermic reactions?
(b) Give one example of an exothermic reaction and one of an endothermic reaction.
(c) Which of the following are endothermic reactions and which are exothermic reactions?
(i) Burning of natural gas
(ii) Photosynthesis
(iii) Electrolysis of water
(iv) Respiration
(v) Decomposition of calcium carbonate

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